PAES terms

Cards (898)

  • Biogas plant
    Plant used to process animal wastes or manure to produce biogas and sludge consisting of an inlet/mixing tank, digester, gas chamber and outlet/sludge tank
  • Integrated plant
    Biogas plant where the digester and gas chamber form one unit
  • Split type plant
    Digester and gas chamber form separate units
  • Multi digester
    Plant with series of digesters
  • Floating type
    Plant consisting of digester and a moving, floating gasholder that either float directly in the fermenting slurry or in a separate water jacket
  • Fixed type
    Closed digester with an immovable, rigid gas chamber and a displacement pit
  • Balloon type
    Plant consisting of a heat-sealed plastic or rubber bag (balloon), combining digester and gasholder
  • Collecting tank
    Holding tank; chamber where manure and water are collected, stored and separated from heavy and nonbiodegradable materials before feeding them into the digester
  • Inlet pipe
    Serves as conveyor of the manure-water mixture or slurry from the mixing tank to the digester
  • Digester
    Any water and air tight container designed for the process of anaerobic microbiological degradation of organic matter into which the slurry is introduced for digestion and methanization
  • Baffle board
    Division in the digester that prevent the slurry from premature exit into the sludge/outlet tank
  • Stirrer
    Agitator; mechanical device inside the digester used to stir the slurry
  • Gas chamber
    Space inside or outside the digester for the collection and storage of biogas
  • Gas holder retainer
    Cantilever beam that holds the gasholder/movable cover in position at the desired biogas pressure
  • Outlet pipe
    Serves as conveyor where the effluent or the slurry is forced out
  • Backfill
    Layer of compacted soil and gravel to support the digester wall
  • Loading rate

    Amount of slurry fed per unit volume of digester capacity per day
  • Substrate
    Organic material used to produce biogas
  • Seeding
    Adding or introducing anaerobic bacteria to the digester
  • Slurry
    Mixture of manure and water
  • Freeboard
    Difference in height between the digester wall and the filling line
  • Filling line
    Level of slurry when the digesters is at full load
  • Retention time

    Average period that a given quantity of slurry is retained in the digester for digestion
  • Toxic materials
    Materials that inhibit the normal growth of pathogens in the digester such as mineral ions, heavy metals and detergents
  • Methanization
    Various processes that take place among the methanogens, non-methanogens and substrates fed into the digester as inputs
  • Methanogens
    Anaerobic bacteria that act upon organic materials and in the process, produce biogas
  • Mesophilic temperature range
    Temperature range of 20 oC40 oC where mesophilic bacteria operates
  • Gas production rate
    Amount of biogas produced per day per cubic meter of slurry
  • Biogas
    Mixture of gas (composed of 50 to 70 percent methane and 30 to 40 percent carbon dioxide) produced by methanogenic bacteria
  • Scum
    Layer of floating material (mainly fibrous) on the slurry
  • Sludge
    Settled portion or precipitate of the slurry; a mud-like, semi-solid mass
  • Effluent
    Residue that comes out at the outlet after the substrate is digested/processed inside the digester
  • Feedlot
    Area with its physical facilities used for carabao fattening
  • Carabao
    Philippine water buffalo or swamp buffalo
  • Bull
    Breeding male of any age
  • Calf
    Young male or female under one year of age
  • Cow
    Mature female that has already calved
  • Heifer
    Female between two to three years of age which has not given birth
  • Corral
    Enclosure for confining and handling livestock
  • Holding pen
    Pen for confining animals from the pasture